Learn more physics!
If a photon has zero rest mass, then how it could have energy in terms of E=MC^2 (M is rest mass). If M is zero then E is also zero. Isn't it this way?
New Delhi, India
You wrote down only part of the full equation. The correct relation between energy, mass and momentum is E2
, where p is the momentum. So for a zero rest-mass photon it becomes E = pc.
Look at http://en.wikipedia.org/wiki/Mass_in_special_relativity
for more information.
(published on 03/09/11)
Follow-up on this answer.